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[#50] As a developer, I can use String extensions in effective way #51

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Merged
hoangnguyen92dn merged 3 commits into from
Dec 17, 2025
Merged

[#50] As a developer, I can use String extensions in effective way #51

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fe51901
[#50] Add contract{} to String extensions
hoangnguyen92dn Feb 12, 2025
12135c4
[#50] Fix incorrect contract logic
hoangnguyen92dn Dec 16, 2025
de023ea
[#50] Extract regex to top-level val
hoangnguyen92dn Dec 16, 2025
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23 changes: 19 additions & 4 deletions common-ktx/src/main/java/co/nimblehq/common/extensions/StringExt.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,14 +2,24 @@ package co.nimblehq.common.extensions

import androidx.core.util.PatternsCompat
import java.util.*
import kotlin.contracts.ExperimentalContracts
import kotlin.contracts.contract

private val THAI_REGEX = "([\\u0E00-\\u0E7F]+)".toRegex()

/**
* Check if the string not null or empty.
* This extension wraps for more readable.
*
* @return true if this nullable char sequence is NOT either null or empty
*/
fun String?.isNotNullOrEmpty(): Boolean = !this.isNullOrEmpty()
@OptIn(ExperimentalContracts::class)
fun String?.isNotNullOrEmpty(): Boolean {
contract {
returns(true) implies (this@isNotNullOrEmpty != null)
}
return !this.isNullOrEmpty()
}

/**
* Check if the string not null or blank.
Expand All @@ -18,7 +28,13 @@ fun String?.isNotNullOrEmpty(): Boolean = !this.isNullOrEmpty()
* @return true if this nullable char sequence is NOT either null or empty or consists solely of
* whitespace
*/
fun String?.isNotNullOrBlank(): Boolean = !this.isNullOrBlank()
@OptIn(ExperimentalContracts::class)
fun String?.isNotNullOrBlank(): Boolean {
contract {
returns(true) implies (this@isNotNullOrBlank != null)
}
return !this.isNullOrBlank()
}

/**
* Eliminate the given character then titleize.
Expand Down Expand Up @@ -68,6 +84,5 @@ fun String.isEmailValid(): Boolean {
* @return true if this string is Thai
*/
fun String.isThai(): Boolean {
val thaiRegex = "([\\u0E00-\\u0E7F]+)".toRegex()
return if (isEmpty() || isBlank()) false else all { thaiRegex.matches(it.toString()) }
return isNotEmpty() && all { THAI_REGEX.matches(it.toString()) }
}
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